| William Harrison Marsh | |
| Office: | 2nd United States Ambassador to the United Nations Agencies for Food and Agriculture |
| President: | George H. W. Bush |
| Term Start: | July 24, 1992 |
| Term End: | September 4, 1994 |
| Predecessor: | Gerald J. Monroe |
| Successor: | Thomas Austin Forbord |
| Birth Date: | 1931 |
| Birth Place: | Pennsylvania, U.S. |
| Death Date: | September 26, |
| Death Place: | Mitchellville, Maryland, U.S. |
| Alma Mater: | Princeton's Woodrow Wilson School |
William Harrison Marsh (1931, Pennsylvania–September 26, 2017, Mitchellville, MD)[1] was the United States Ambassador to the United Nations Agencies for Food and Agriculture from July 24, 1992, until September 4, 1994.[2]
Marsh graduated from Cornell University in 1953 with a degree in government and an MPA in 1957 from Princeton's Woodrow Wilson School after spending two years in the Air Force.[3]